The results of a study of the nature of the occurrence of fine dust particles in the urban environment (on the example of the city of Volgograd) are presented. The sources of dust release in the form of ground dispersed massifs represented by loess and clayey soils are considered. The results of determining the mode of variability of the parameters of the mechanical composition, physical properties in two directions of dust drift (southeast and north) are shown. Studies of loess and clayey rocks for radon content were carried out. It was revealed that the dispersed soils under consideration are characterized by significant indicators of the effective specific activity of radon. Researches of pollution of a snow cover are carried out. It was found that the snow cover, in addition to technogenic accumulations, contains particles of fine dust. The results of the study will help in the implementation of predictive assessments of possible changes in the environment.

Keywords: atmospheric pollution, fine dust, urban environment, dispersed rock, wind flow, soil massif, radon content, drift trend of fine earth

The article considers internal adjustable sun-protecting jalousies from their different functional efficiency pant of view. It is noted, that besides their main sun-protective function, adjustable jalousies possess some other functions, depending on the position of their horizontal planks. These functions can be successfully used for microclimatic internal environment creation of comfortable. These are natural lighting function, psychological contract with surrounding environment function and function of visual isolation, i.e. “privacy”. and so on. All the above functions usually have maximum efficiency of their qualities in the case of their individual consideration. This, as a rule, is not practically reasonable. That is why this work is aimed on optimum combination of the man functional characteristics of horizontal sun-protecting jalousies under necessity of their mutual consideration, i.e. in achievement of their functional universality.

Keywords: sun-protecting devices, horizontal jalousies, functional characteristics, comfort of internal environment, optimization, insolation, visual comfort, functional universality, natural lighting

An analysis of the use of ceramic products in the total volume of use of wall materials is given. It is shown that with the plastic method of molding ceramic products, a change in the quality of raw materials can lead to the production of low-quality products (defective products). The basic technological properties of clay raw materials from the Taushinsky deposit in the Perm Territory, as well as its granulometric and mineral compositions, have been studied. It is shown that the adjustment of the composition of the ceramic mixture with a change in the characteristics of the feedstock should be carried out taking into account the features of mineral formation in an 8-component oxide system. A comparison of the physical and mechanical characteristics of two batches of bricks of the current and corrected compositions was made, which makes it possible, with some assumptions, to consider them identical.

Keywords: ceramics, brick, clay, deposit, optimization,batch mixture, firing, production, plastic molding method , strength

The article raises an urgent problem for large cities - the fight against the negative consequences of road transport. The importance of urban planning measures to reduce the accumulation of emissions, as well as green spaces to reduce the concentration of dust content of harmful substances in urban areas is considered. The data of CO concentration near the mainline territories in 95 studied points were analyzed.

Keywords: road transport, dust, gas-protected green areas, leaves, green spaces

The main message of the scientific article is overview of types construction concrete structures at low temperatures. Two main methods of concreting at low temperatures are considered. The first method is using of antifreeze additives. Second method is application of electric heating of concrete with PNSV heating cable. In end of the article shows a technical and economic comparison of these method, is given a short calculation.

Keywords: concrete, reinforced concrete, concreting, low temperatures, hardening problems, concrete strength, antifreeze additives, electric heating of concrete

The development of the construction industry has both positive aspects of a social and economic nature, and negative ones - associated with an increase in the number of accidents, low quality of construction and installation work and the emergence of disputes between participants in construction production. The resolution of conflict situations arising in the construction industry between business entities is possible with the use of special construction and technical knowledge. One of the most demanded forms of application of such knowledge is judicial construction and technical expertise.

Keywords: construction, construction and technical research, forensic construction and technical expertise, expert opinion, research questions

The article considers the cramped conditions of urban development, its types and main problems, during construction work. The organization of monolithic works at the construction site is also presented.

Keywords: monolithic works, constrained construction conditions, constriction, organization of monolithic works, concreting, construction site, monolithic framework, building compaction, problems of constriction, organization of construction, point development

In today's Russian society, people with limited mobility often have limited access to urban resources; therefore, ensuring their independent life is an important task for the state and society. The idea of forming a barrier-free urban environment is relevant, which necessitates the creation of modern and promising methods for adapting urban space for people with limited mobility.

Keywords: barrier-free environment, people with limited mobility, accessible urban environment, city territory, infrastructure, government program

This article is devoted to the study of concentrations of carbon monoxide (II), phenol, formaldehyde, aliphatic hydrocarbons in the premises of buildings, including the assessment of the regularities of their vertical distribution in the height of buildings at different times of the day from vehicles. Research is necessary to develop a program for electronic computers, which is necessary for the design of construction projects.

Keywords: помещения, оксид углерода (II), фенол, формальдегид, углеводороды алифатические, здания, время суток

An analysis of the accident rate on gas pipelines is given. Mathematical dependences of the volume of gas entering the atmosphere during the degassing of a gas pipeline section are given. Based on the existing nomogram for determining the gas compressibility factor for main gas pipelines, a nomogram for natural gas transported through gas distribution networks was constructed.

Keywords: gas pipelines, accident rate, degassing, gas bleeding, gas compressibility factor

The results of an experimental study of the process of laying asphalt mix with automation components of the technology of non-destructive continuous compaction control in the field of road construction are presented. The research was carried out in order to obtain real data for the task of creating a quality control system for compacting road materials in real time. During the study, the operating parameters of the paver were measured (velocity of movement, the frequency of impacts of the tamper, the frequency of vibration of the plate), the temperature of the compacted asphalt mixture, the thickness of the pavement layer, the vertical acceleration of the vibrating plate. The study used asphalt concrete mix type A grade I according to GOST 9128-2013. The operating parameters varied: the frequency of impacts of the tamper, the frequency of vibration of the plate. The acceleration of the vibrating plate was determined using a digital accelerometer with wireless signal transmission via Bluetooth to a smartphone with the Android operating system. The paper obtained the values of dimensionless complexes, the index of compaction of asphalt concrete mixture - the peak factor characterizing the change in the quality of compaction of asphalt concrete mixture.

Keywords: asphalt mix, non-destructive technologies, continuous compaction control, compaction index, acceleration of vibrating plate

During the reconstruction of facilities carried out in the conditions of existing urban development, questions often arise to solve the specific task of carrying out work on capital construction projects. For example, the work considered in the article on the reconstruction of health facilities is carried out in the conditions of existing institutions, various campuses or environments. At the same time, a number of factors that significantly affect the labor costs of workers, the methods of organizational and technological design adopted in construction are not taken into account. In the process of organizing reconstruction work in conditions of limited space and in rooms of small volume, there is a problem of determining the duration of work. There is also a problem of determining the number of necessary labor resources for a directive specified duration according to the terms of Government contracts. To solve the problem of coordination, the article considers the possibility of using transactional platforms.

Keywords: reconstruction, healthcare facilities, organizational and technological solutions, documentation, workspace, time, labor costs, transactional model, productivity

The results of the studies show that the manufacturer of composite materials for the consumption of reinforced concrete structures depends and produces materials for reinforcement, material properties and their quality. Such a thing requires the study of properties, fixing in the structure of materials. The article is devoted to the appeal. A program has been specially developed for influencing structures with unexplored, but the most popular composite materials in Russia, in particular, in the Rostov region. Certain parameters of reinforced structures that will be checked during the testing process. The program of the experiment was designed in such a way as to capture the most important reinforced concrete structures used in construction.

Keywords: concrete, reinforced concrete, composite material, carbon fiber reinforced plastic, external reinforcement, deformations, compressed elements

The concept of sustainable development of cities determines the relevance of the formation of organizational and technological approaches to the creation and development of urban public spaces in accordance with modern trends in urban planning and the needs of the population. Urban public spaces are the key to the development of a comfortable urban environment and represent the cultural and social aspect of the modern city.

Keywords: urban public spaces, comfortable urban environment, sustainable development, improvement, city territory, infrastructure

The focus of attention is on the possibility of replacing exterior envelope structures for reconstruction of industrial buildings with the aim of increasing the plant areas. The operating procedures are shown alongside the material characteristics ensuring energy efficiency of reconstruction. The paper underlines that the justification of the optimal choice of a process setup / technology solution is an important stage in building reconstruction.

Keywords: three-layer envelope structures, fiber-reinforced foamed concrete units, composite foams, insulating properties, lightweight, efficiency

In this article is considered progressive technology for producing heat-insulating materials by the method of self-compacting masses. Implementation of this method will allow obtain a significant economic effect in comparison with traditional technologies. Due to the use of the effect of obtaining excess pressure in a closed perforated form from an increase in volume during heating of pre-expanded polystyrene granules, it became possible to remove excess moisture, reduce the time of the technological process, and reduce energy consumption. This method allows to combine several processes in one operation: compaction of the mixture, heat treatment, removal of excess moisture. As a result of theoretical and laboratory research and experimental-production approbation, the possibility of implementing of heat-insulating materials of a wide range of applications with improved operational properties into mass production has been obtained. Perlite concrete is one of the effective heat-insulating material, the production of which is possible using the method of self-compacting masses. An assessment of the qualitative efficiency of perlite concrete was carried out: the thermal conductivity coefficient is within the limits required for effective heat-insulating materials. It was concluded that the use of perlite concrete in construction is promising: it is possible to reduce the drying time in 10-12 times, eliminate drying shrinkage, eliminate mechanical processing of products after heat treatment, obtain products of various configurations and volumes, with an improvement in strength characteristics at a minimum density. In this article is considered progressive technology for producing heat-insulating materials by the method of self-compacting masses. Implementation of this method will allow obtain a significant economic effect in comparison with traditional technologies. Due to the use of the effect of obtaining excess pressure in a closed perforated form from an increase in volume during heating of pre-expanded polystyrene granules, it became possible to remove excess moisture, reduce the time of the technological process, and reduce energy consumption. This method allows to combine several processes in one operation: compaction of the mixture, heat treatment, removal of excess moisture. As a result of theoretical and laboratory research and experimental-production approbation, the possibility of implementing of heat-insulating materials of a wide range of applications with improved operational properties into mass production has been obtained. Perlite concrete is one of the effective heat-insulating material, the production of which is possible using the method of self-compacting masses. An assessment of the qualitative efficiency of perlite concrete was carried out: the thermal conductivity coefficient is within the limits required for effective heat-insulating materials. It was concluded that the use of perlite concrete in construction is promising: it is possible to reduce the drying time in 10-12 times, eliminate drying shrinkage, eliminate mechanical processing of products after heat treatment, obtain products of various configurations and volumes, with an improvement in strength characteristics at a minimum density.

Keywords: method of self-compacting masses, heat-insulating perlite concrete, electric heating, closed perforated volume, bead polystyrene, energy efficient material

When designing flat reinforced concrete slabs, the most complex and responsible structural unit is the area where the slab is supported by the column. This is due to the action of large concentrated efforts and the greatest density of reinforcement. In view of this, the issue of choosing calculation methods that most accurately estimate the punching capacity for suchstructural units is relevant. The article analyzed experimental data for 73 samples of flat reinforced concrete slabs without shear reinforcement from 10 different sources and compared with the results of calculations of the punching shear resistance according to SP 63.13330.2018, EN 1992 Eurocode 2 and Model Code 2010.

Keywords: punching shear resistance, flat reinforced concrete slab, static load

Monitoring of aerosols in the atmospheric air of residential areas of settlements ensures their environmental safety. Aerosol particles are capable of adsorbing various compounds, including metals, on their surface. It is known that heavy metals from the environment can penetrate into the human body and contribute to the development of various diseases. In this connection, their monitoring is relevant to ensure the environmental safety of residential areas of settlements. The purpose of the study was to study the indicators of the number and mass fraction of particles in the Sredneakhtuba district (Sredneakhtuba district, Volgograd region) for the spring-summer of 2019 in comparison with the conditionally clean zone. The material of the study was the leaves of Prunus armeniaca with aerosol particles. Leaves of Prunus armeniaca were placed in a glass container with 250 ml of distilled water, stirred for several minutes with a glass rod to wash particles from the surface of the leaves. As a result, aerosol suspensions were obtained, which were studied in terms of the number of particles and their mass fraction. The results obtained indicate almost the same amount of aerosol particles (PM10) in both territories. In terms of the mass fraction of aerosol particles (PM10), there is a significant excess of them in the experimental area. This fact may indicate the presence of metallic impurities in the aerosols of the residential area of ​​Srednyaya Akhtuba. At the same time, it should be noted that the high values ​​of the number of aerosol particles in the conditionally clean zone cast doubt on its status as a clean zone, since within a radius of 25 km. there is no anthropogenic load on it. The detected values ​​of aerosol particles give grounds to assume the action of a random factor (the introduction of aerosol pollution by transit air), or the action of an unknown natural source of pollution, which requires further research and study of the territory of a conditionally clean zone in combination with geochemical studies, etc.

Keywords: environmental monitoring, environmental risks, aerosols; number and mass fraction of particles

The article discusses the principles of design and arrangement of foundations using soil-lime pads on subsiding soils in special natural and climatic conditions of the Republic of Tajikistan. Recommendations for the design of bases and foundations for civil buildings for the territory of the republic have been studied and proposed.

Keywords: bases, foundation, subsiding soil, buildings, structures, soil-lime pad, foundation pit, seals, strength, density, pressure

This article contains the results of a study of the strength characteristics of concrete with the addition of various amounts and shapes of recycled polyethylene terephthalate (PET) fibers. In general, the use of fiber in concrete from waste PET materials (obtained by mechanical grinding), rather than heat-treated, can increase the tensile strength. The compressive strength is reduced. Industrial flex is not recommended to be used as a fiber (additive) in concrete, as this leads to a decrease in strength characteristics. Increased tensile strength is provided through the use of specially prepared PET fiber. The conducted research proved the possibility of using PET fiber in concrete from waste PET materials (obtained by mechanical grinding) PET fiber is recommended for use in concrete structures to increase tensile strength.

Keywords: concrete, concrete matrix, fiber, dispersed reinforcement, polyethylene terephthalate, tensile strength, compressive strength

The article deals with project management as one of the most important mechanisms of management in the system of market economy. In Russia, the field of project management, including construction, is actively developing, taking into account international experience and national peculiarities. Digital transformation of technological and business processes in construction is rather weak compared to other Russian industries, which is due to the specific activities of construction companies, during which the necessary data are not accumulated continuously, but are collected at different stages of the project. The experience of implementing digital technologies in the implementation of investment and construction projects is considered on the example of the experience of a federal construction company, whose branches are located in several Russian cities.

Keywords: construction, project, investment, digitalization, digital technologies, BIM technologies, online office, Bitrix24 service, 1C:PM Project Management, CORP, VIM-model

The choice of options for strengthening reinforced concrete structures is based on a large number of factors based on technical capabilities and economic efficiency. Modern construction requires new reinforcement methods that allow reducing labor costs and work time, while maintaining the aesthetic appearance of a building under construction or being restored. The stumbling block is the issue price and the reliability of new amplification methods. For this purpose, known and used reinforcement methods based on materials such as reinforced concrete and metal were compared with a fairly new reinforcement method used materials based on carbon fabric. This article provides examples and results of calculations for the reinforcement of a column with a reinforced concrete, metal and composite cage. Based on the results of the calculations, a technical and economic comparison of the existing reinforcement options was carried out.

Keywords: "concrete, reinforced concrete, composite material, carbon fiber reinforced plastic, external reinforcement, deformations, compressed elements

The article assesses the economic situation in the Far East and identifies the problems of effective development of the territory. The article considers construction technologies and engineering solutions that can be used by the participants of the state program "Far Eastern hectare" for the effective use of land. The territory of the Far East has been divided into regions that are relatively homogeneous in terms of natural and climatic conditions (the Republic of Sakha (Yakutia), Khabarovsk and Primorsky Territories), and optimal technologies for low-rise construction, technological solutions in terms of the device of autonomous heating and an autonomous solar power station for the designated areas are proposed.

Keywords: construction, low-rise construction, the Far East, "Far Eastern hectare", thermal efficiency unit, SIP panels, energy efficiency, "green" construction, construction 3-D printer, sandwich panels

Polymer concrete is a concrete that uses polybutadiene, a polymer from the liquid rubber family, as a binder, so that it has elastic properties and is extremely resistant to aggressive chemicals, high water repellency and high compressive strength. It does not reveal the destruction typical for ordinary concrete, such as cracking and peeling. It has a high electrical resistance, increased mechanical compressive and tensile strength. In addition, polymer concrete is a durable material with water-repellent properties and resistance to aggressive chemical environments. The proposed polymer concrete uses a conventional aggregate, which is used to produce ordinary concrete, but a polymer is used as a binder. Also, the usage of non-metal composite reinforcement is proposed (APP patent No. 16983646). Below are the results of testing samples with three types of dispersed reinforcement.

Keywords: polymer concrete, rubber concrete, composites, fittings, manufacturing methods, testing